From eeefce1d3462c2f841742febb05447df96cbcd22 Mon Sep 17 00:00:00 2001
From: Peter Palfrader <peter@palfrader.org>
Date: Mon, 21 Jun 2010 13:44:55 +0200
Subject: [PATCH] Do some hostname validity checking

---
 dsa-nagios-checks/checks/dsa-check-log-age-loghost | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/dsa-nagios-checks/checks/dsa-check-log-age-loghost b/dsa-nagios-checks/checks/dsa-check-log-age-loghost
index 256caef..391f330 100755
--- a/dsa-nagios-checks/checks/dsa-check-log-age-loghost
+++ b/dsa-nagios-checks/checks/dsa-check-log-age-loghost
@@ -29,10 +29,15 @@ usage(){
 
 host="$1"
 if [ -z "$host" ] || [ "$host" = "-h" ] ||  [ "$host" = "--help" ]; then
-	echo >&2 "$0: Usage: $0 <host>"
+	echo >&2 "Usage: $0 <host>"
 	usage 3
 fi
 
+if [ "${host/[^a-z0-9]/}" != "$host" ]; then
+	echo >&2 "$0: Invalid hostname $1"
+	exit 3
+fi
+
 ts=$(date -d 'now' +'%Y/%m/%d')
 file="/var/log/hosts/$host/$ts/syslog"
 if [ ! -e "$file" ]; then
-- 
2.20.1